"No matter whether they are on or off duty, they should behave themselves because the public have high expectations of them," Tsang said.

He said several officers had expressed concern to the association, saying that the photographs would harm the force's reputation.

Tsang said the association would hold a meeting to discuss whether there was a need to step up discipline among newly recruited and junior officers.

"The force's management should also look into whether new guidelines or circulars should be issued to ensure no such incident happens again," Tsang said.

The force said in a statement that an initial investigation showed the blog did not include personal information or confidential data.

"Police will not tolerate any conduct that damages the force's reputation," it said.

There have been previous cases of photographs of police officers being published or posted on social networking sites.

In November last year, a photo showing a policeman's female relative pointing a handgun at him was published in a Chinese-language newspaper.

In November 2009, two officers took photos of each other during a bicycle patrol at Tolo Harbour in Tai Po. The pictures appeared on the internet, showing the constables, one male and one female, in various poses.(SCMP)

It is exactly like a Wong Jing movie, although this was directed by Martin Lau and produced by Lam Yat-Miu with no assistance from the sleazemaster.

"Brush Up My Sisters" features Teresa Mak, Natalie Ng and Pinky Cheung as police cadets with Jade Leung as their drill instructor. They run around in shorts and cropped tops, take long showers, give each other massages and act generally the way one hopes they would while staying with in the fleshy confines of Category IIb. -----------

If I were a senior Hong Kong police official I would be a lot more concerned about pictures of police officers pointing guns at the heads of other officers than anything else in these pictures.